during fixation of a femoral neck fracture in a 23-year-old male patient with cannulated screws, a broken guide wire fragment inadvertently advanced through the hip joint and protruded into the pelvis. a second surgical approach was needed to remove the broken fragment from the pelvis. awareness of such a potentially devastating complication will make surgeons more cautious during implementatio...

We review some approaches to macroscopic irreversibility from reversible microscopic dynamics, introducing the contribution of time dependent perturbations within the framework of recent developments in non-equilibrium statistical physics. We show that situations commonly assumed to violate the time reversal symmetry (presence of magnetic fields, rotating reference frames, and some time depende...

When it comes to experiencing pain, most people will agree that is an uncomfortable sensation we would rather avoid. Pain can vary in intensity—ranging from the mild of stubbing your toe intense pain a broken bone—and generally think as bad thing. But be thought two ways: sometimes warning signal something wrong with our bodies, but other times benign, meaning not indication necessarily wrong. ...